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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 13 |
| 5 | 60 |
| 6 | 246 |
| 7 | 1266 |
| 8 | 6679 |
| 9 | 39568 |
| 10 | 247940 |
| 11 | 1677435 |
| 12 | 12020295 |
| 13 | 91463410 |
| 14 | 733490265 |
| 15 | 6189608760 |
| 16 | 54746987035 |
| 17 | 506444804075 |
| 18 | 4887127598817 |
| 19 | 49096724251235 |
| 20 | 512474550910080 |
| 21 | 5548429401985372 |
| 22 | 62208756548406172 |
| 23 | 721256031012180537 |
| 24 | 8635815672831322186 |
[0,1,1,5,13,60,246,1266,6679,39568,247940,1677435, 12020295,91463410,733490265,6189608760, 54746987035,506444804075,4887127598817, 49096724251235,512474550910080,5548429401985372, 62208756548406172,721256031012180537, 8635815672831322186] |